Basin



FIG. 1 is a perspective view of a basin showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a front view thereof; and,

FIG. 5 is a side view of a first side thereof, and the opposite side is substantially a mirror image of the side view shown in FIG. 5.

The bottom does not form part of the claimed design. The broken lines, which define the bounds of the claimed design, form no part thereof. 

The ornamental design for a basin, as shown and described. 